UIStackView体验

更方便的布局方式，9.0以后才能使用

#import "ViewController.h"

@interface ViewController ()

///stackView
@property (nonatomic,weak) UIStackView * stackView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    UIStackView * stackView = [[UIStackView alloc] init];
    stackView.frame = CGRectMake(0, (self.view.frame.size.height-200)*0.5, self.view.frame.size.width, 200);
    [self.view addSubview:stackView];
    self.stackView= stackView;
    
    //子视图
    UIButton * btn0 = [[UIButton alloc] init];
    btn0.backgroundColor = [UIColor yellowColor];
    UIButton * btn1 = [[UIButton alloc] init];
    btn1.backgroundColor = [UIColor greenColor];
    UIButton * btn2 = [[UIButton alloc] init];
    btn2.backgroundColor = [UIColor purpleColor];
    
    //子视图间隔
    self.stackView.spacing = 2;
    
    //布局方向 (默认横向布局)
    self.stackView.axis = UILayoutConstraintAxisHorizontal;
    
    //子视图对齐方式 (枚举值)
    self.stackView.alignment = UIStackViewAlignmentFill;
    
    //子视图分部方式 (枚举值)
    self.stackView.distribution = UIStackViewDistributionFillEqually;
    
    [self.stackView addArrangedSubview:btn0];
    [self.stackView addArrangedSubview:btn1];
    [self.stackView addArrangedSubview:btn2];
    
    //添加删除插入子视图方法---
    
    //将子视图，添加到 stackView 的 arrangedSubviews列表中
    
    //[self.stackView addArrangedSubview:label];
    
    //删除 stackView的 arrangedSubviews列表中的 view
    
    //[self.stackViewremoveArrangedSubview:lastLabel];
    
    //插入一个视图到 stackView的 arrangedSubviews列表中
    
    //[self.stackViewinsertArrangedSubview:labelatIndex:2];
}

@end